JP2017220394A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of luminance unevenness in a light guide body by controlling light emitted from an emission surface of a bent part.SOLUTION: A vehicular lighting fixture 1 includes a light guide body 7 which has: an incident surface 13a for allowing the light emitted from a light source 18 to enter; a reflection surface 11 for internally reflecting the light which has entered from the incident surface; and an emission surface 12 for emitting the light internally reflected on the reflection surface. The light guide body includes: a bent part 14 in which at least one part of the emission surface is formed and which is bent in a predetermined state; and a step forming part 13 in which a light control step 13b is formed and whose bending degree is smaller than that of the bent part. At least one part of the light controlled in the light control step is emitted from the emission surface of the bent part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a technical field relating to a vehicular lamp having a light guide that guides light emitted from a light source.

JP 2013-171658 A

  In a vehicular lamp, for example, a light source and a light guide are arranged inside a lamp outer casing constituted by a cover and a lamp housing, and light emitted from the light source is guided by the light guide and is emitted from the light guide. There is a type that is irradiated from the outside to the outside.

  The light guide is generally formed in a shape extending in a predetermined direction. A light source is disposed at a position facing the incident surface of the light guide, and the light emitted from the light source is incident from the incident surface, and the incident light is reflected from the inner surface and guided in the direction in which the light guide extends. At least a part of the reflected light is emitted from the emission surface.

  Such a light guide is formed in various shapes according to the shape of a vehicle or a vehicle lamp, and is provided as a bent portion that is partially bent (see, for example, Patent Document 1).

  In the vehicular lamp described in Patent Document 1, a bent portion bent by approximately 90 ° is provided, one end surface in the longitudinal direction is formed as an incident surface, and a light source is disposed at a position facing the incident surface. ing.

  By the way, in the light guide having the bent portion as described above, the light guide direction is changed by changing the direction in which light is reflected on the inner surface of the bent portion with respect to the other portions, so that the light is emitted from the bent portion. There is a possibility that the amount of emitted light may increase or decrease relative to other parts, or the direction of light emitted from the bent part may be different.

  Therefore, in a light guide having a bent portion, luminance unevenness easily occurs due to increase / decrease in the amount of light or change in the emission direction.

  Accordingly, an object of the vehicle lamp of the present invention is to overcome the above-described problems and control the light emitted from the exit surface of the bent portion to suppress the occurrence of uneven brightness in the light guide.

  First, a vehicular lamp according to the present invention includes an incident surface that receives light emitted from a light source, a reflection surface that internally reflects light incident from the incident surface, and light that is internally reflected by the reflection surface. A vehicular lamp including a light guide having an exit surface that emits light, wherein the light guide includes a bent portion in which at least a part of the exit surface is formed and bent in a predetermined state, and light control A step forming portion is provided, and a step forming portion having a degree of bending smaller than that of the bent portion is provided, and at least part of the light controlled in the light control step is emitted from the exit surface of the bent portion.

  Thereby, the light is controlled by the light control step formed in the step forming portion whose degree of bending is smaller than that of the bent portion, and the light controlled by the light control step is emitted from the exit surface of the bent portion.

  Secondly, in the vehicle lamp according to the present invention described above, it is desirable that a diffusion step is formed as the light control step.

  Thereby, the light incident from the incident surface is diffused by the diffusion step, and the amount of light emitted from the exit surface of the step forming portion increases.

  Thirdly, in the vehicle lamp according to the present invention described above, it is preferable that a cylindrical step provided continuously in the circumferential direction of the step forming portion is formed as the diffusion step.

  Thereby, the light incident from the incident surface is diffused by the cylindrical step, and the amount of light emitted from the exit surface of the step forming portion increases.

  4thly, in the vehicle lamp which concerns on this invention mentioned above, the said light guide is provided with the plate-shaped part into which the light which permeate | transmitted the said bending part was continued following the said bending part, and said plate-shaped It is desirable that the end surface of the portion in the traveling direction of the light incident from the bent portion is formed into a curved surface.

  As a result, light directed from the bent portion to the plate-like portion is easily emitted from the plate-like portion by the curved surface, and the amount of light internally reflected by the plate-like portion is reduced.

  Fifth, in the above-described vehicular lamp according to the present invention, the step forming portion and the bent portion are continuously provided in the light traveling direction, and light is applied to the inner peripheral portion of the bent portion by the light control step. It is desirable to be guided.

  As a result, the amount of light guided to the inner peripheral portion of the bent portion increases, so that the light emitted from the outer peripheral side and the inner peripheral side of the bent portion is made uniform.

  According to the present invention, the light is controlled by the light control step formed in the step forming portion whose degree of bending is smaller than that of the bent portion, and the light controlled by the light control step is emitted from the exit surface of the bent portion. It is possible to suppress the occurrence of uneven brightness in the light guide by controlling the light emitted from the exit surface of the bent portion.

2 to 17 show an embodiment of a vehicular lamp according to the present invention, and this figure is a horizontal sectional view of the vehicular lamp. It is a perspective view of a light guide. It is an expansion perspective view of a step formation part. It is an expanded sectional view which follows the IV-IV line of FIG. It is a figure which shows the state from which the light diffused from the bending part is radiate | emitted. It is a figure which shows the state in which light is reflected in the 2nd edge part of a plate-shaped part, and is radiate | emitted from an area | region part. It is a figure which shows the state in which light is radiate | emitted from the curved surface of a plate-shaped part. 9 to 12 show a light guide according to a modification, and this figure is a front view. It is an expanded sectional view which follows the IX-IX line of FIG. It is a figure which shows an optical path in the expanded sectional view which follows the XX line of FIG. It is an expansion perspective view which shows a bending part etc. It is an expanded sectional view which follows the XII-XII line | wire of FIG. FIG. 14 to FIG. 17 show the light guide when the end is not shielded by the extension, and this figure shows the optical path when the diffusion step is not formed on the exit surface. It is a figure which shows an optical path when the diffusion step is formed in the output surface. It is a front view which shows the example in which the cylindrical step was formed as a diffusion step. It is a front view which shows the example in which another cylindrical step was formed as a diffusion step. It is a front view which shows the example in which the fisheye step was formed as a spreading | diffusion step.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the vehicle lamp of this invention is demonstrated with reference to an accompanying drawing.

  In the embodiment shown below, the vehicular lamp of the present invention is applied to a clearance lamp. The scope of application of the present invention is not limited to the clearance lamp, but a head lamp, tail lamp, turn signal lamp, stop lamp, daytime running lamp, cornering lamp, hazard lamp, position lamp, back lamp, fog lamp, etc. It can be widely applied to various vehicle lamps such as a combination lamp which is a combination of the above.

  The vehicular lamp 1 is attached and arranged at both left and right ends of the front end of the vehicle body.

  The vehicular lamp 1 includes a lamp housing 2 having an opening at the front and a cover 3 for closing the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and the inner space of the lamp outer casing 4 is formed as a lamp chamber 5.

  An extension 6 formed in an annular shape and a light guide 7 partially covered with the extension 6 are disposed in the lamp chamber 5.

  The space inside the extension 6 is formed as a transmission hole 6a.

  The light guide 7 is made of a transparent material (see FIG. 2), and extends along the cover 3. The light guide 8 extends from the both ends of the light guide 8 in the longitudinal direction. And a plate-like portion 10 protruding from a part of the light guide portion 8.

  The light guide 7 is disposed in the lamp chamber 5 by being attached to the mounting member (not shown) in which the mounted portions 9 and 9 are disposed in the lamp chamber 5 or the lamp housing 2 by screwing or the like.

  The light guide 8 is formed in a substantially circular shape or a substantially oval shape in a cross-sectional shape orthogonal to the longitudinal direction (see FIGS. 2 and 3).

  Reflecting steps 8a, 8a,... Are formed on the lamp housing 2 side portion on the outer peripheral surface of the light guide portion 8, and a portion where the reflecting steps 8a, 8a,. (See FIG. 3 and FIG. 4).

  The light guide 8 is formed with diffusion steps 8b, 8b,... Continuously excluding both ends in the longitudinal direction (see FIGS. 2 and 4). The diffusion steps 8b, 8b,... Are formed in, for example, approximately half of the outer peripheral surface of the light guide 8 on the cover 3 side. The diffusion steps 8b, 8b,... Are formed continuously in the circumferential direction.

  The diffusion steps 8b, 8b,... Have a function of guiding light in the longitudinal direction while reflecting and diffusing light internally, and are formed in, for example, a cylindrical step. However, the light guided inside the light guide 8 is emitted to the cover 3 side depending on the incident angle with respect to the diffusion steps 8b, 8b,. The half part functions as the exit surface 12.

  As shown in FIG. 2, one end portion in the longitudinal direction is provided as the step forming portion 13, the light guide portion 8 is provided as a bent portion 14 that is continuous with the step forming portion 13, and the step forming portion is provided in the bent portion 14. A continuous portion on the side opposite to 13 is provided as the extension 15.

  The step forming portion 13 is formed in a substantially linear shape extending substantially in the front-rear direction, and the tip end surface is formed as an incident surface 13a. Light control steps 13b, 13b,... Are continuously formed in the circumferential direction on the outer peripheral surface of the step forming unit 13 (see FIG. 3). The light control step 13b is formed in a concave shape extending in the longitudinal direction of the step forming unit 13, for example.

  The light control step 13b is a diffusion step, and is formed in a cylindrical step, for example. The light incident from the incident surface 13a in the step forming portion 13 is guided toward the bent portion 14 while being reflected and diffused by the light control steps 13b, 13b,.

  As shown in FIG. 2, for example, the bent portion 14 is formed in a curved shape bent in a state where the first portion 14a continuous to the step forming portion 13 is bent approximately 90 ° so as to protrude substantially upward. The second portion 14b continuous with the first portion 14a is formed in a curved shape bent in a state bent approximately 90 ° so as to protrude substantially downward. Therefore, the step forming portion 13 is less bent than the bent portion 14.

  The extending portion 15 is formed in a substantially linear shape, and is provided as the longest portion in the light guide portion 8.

  The attached portions 9 and 9 protrude from both end portions in the longitudinal direction of the light guide portion 8. The attached portions 9 and 9 are shielded by the extension 6 together with the step forming portion 13 and the distal end portion of the extending portion 15 (see FIG. 1).

  The plate-like portion 10 protrudes from the end of the bent portion 14 and the extended portion 15 on the bent portion 14 side, and is formed in a substantially flat plate shape whose thickness is thinner than that of the light guide portion 8 (see FIGS. 2 and 4). ). The front end portion of the plate-like portion 10 includes a first end portion 16 that is substantially parallel to the extending portion 15 and a second end portion 17 that connects one end of the first end portion 16 and the extending portion 15. . The distal end surface of the second end portion 17 is formed as an outwardly convex curved surface 17a (see FIG. 4).

  In the lamp chamber 5, a light source 18 is disposed at a position facing the incident surface 13a of the step forming portion 13 (see FIG. 5). For example, a light emitting element such as an LED (Light Emitting Diode) is used as the light source 18. In the vehicular lamp 1, the distal end surface of the extending portion 15 may be formed as an incident surface, and a light source may be disposed at a position facing the incident surface of the extending portion 15.

  In the vehicular lamp 1 configured as described above, when light is emitted from the light source 18, the emitted light is incident from the incident surface 13 a of the step forming unit 13. The incident light is internally reflected by the light control steps 13b, 13b,... And diffused and guided toward the bent portion. Since light is guided to the bent portion 14 while diffusing, the incident angle with respect to each surface of the bent portion 14 is large, the amount of light emitted from the exit surface 12 is large (see FIG. 5), and the luminance at the bent portion 14 is increased. Reduction is suppressed.

  On the other hand, when the light control steps 13b, 13b,... Are not formed in the bent portion, the light incident from the incident surface 13a along the step forming portion 13 as in the light P shown in FIG. It is easy to travel, and the number of times of internal reflection at the bent portion 14 is small, and the incident angle with respect to each surface of the bent portion 14 tends to be small. Therefore, in this case, the amount of light emitted from the emission surface 12 is smaller than that in the case where the light control steps 13b, 13b,. Tends to decrease.

  As described above, in the vehicular lamp 1, the light guide 7 is formed with the bent portion 14 where the emission surface 12 is formed and the light control steps 13b, 13b,. A small step forming portion 13 is provided, and at least a part of the light controlled in the light control steps 13b, 13b,... Is emitted from the emission surface 12 of the bent portion.

  Therefore, since the light controlled by the light control steps 13b, 13b,... Formed in the step forming portion 13 having a smaller degree of bending than the bent portion 14 is emitted from the emission surface 12 of the bent portion 14, the bent portion. It is possible to suppress the occurrence of uneven brightness in the light guide 7 by controlling the light emitted from the 14 exit surfaces 12.

  Since the light control steps 13b, 13b,... Are formed in the step forming unit 13, the light is diffused and emitted from the outer peripheral surface of the step forming unit 13. Is shielded by an extension 6. Therefore, the light emitted from the step forming unit 13 hardly affects the light distribution in the vehicular lamp 1, and generation of dazzling light can be prevented and the appearance can be improved.

  Further, a diffusion step is formed as the light control step 13b.

  Accordingly, the light incident from the incident surface 13a is diffused by the diffusion step, and the amount of light emitted from the exit surface 12 of the step forming unit 13 increases, so that the luminance of the step forming unit 13 becomes the luminance of other portions. On the other hand, it is hard to be lowered, and the occurrence of luminance unevenness in the light guide 7 can be effectively suppressed.

  Furthermore, a cylindrical step provided continuously in the circumferential direction of the step forming unit 13 is formed as a diffusion step.

  Accordingly, the light incident from the incident surface 13a is diffused by the cylindrical step and the amount of light emitted from the emission surface 12 of the step forming unit 13 is increased, so that the luminance of the step forming unit 13 is changed to the luminance of other portions. On the other hand, it is hard to be lowered, and the occurrence of uneven brightness in the light guide 7 can be suppressed with a simple configuration.

  A part of the light guided from the step forming portion 13 to the bent portion 14 is further guided toward the extending portion 15, and light is also emitted from the emission surface 12 of the extending portion 15.

  On the other hand, part of the light guided to the bent portion 14 also enters the plate-like portion 10 from the bent portion 14. The light incident on the plate-like portion 10 from the bent portion 14 travels toward the first end portion 16 or the second end portion 17 and is emitted from the first end portion 16 and the second end portion 17. At this time, a part of the light is internally reflected at the first end portion 16 and the second end portion 17, but the light internally reflected by the second end portion 17 is a specific region portion 15 a of the extension portion 15. And is emitted from the region 15a (see FIG. 6).

  Thus, the light internally reflected by the second end portion 17 is emitted from the region portion 15a of the extending portion 15, but the distal end surface of the second end portion 17 is formed as a curved surface 17a, and thus the curved surface. The amount of light emitted from 17a is increased (see FIG. 7).

  Therefore, the light directed from the bent portion 14 to the second end portion 17 of the plate-like portion 10 is easily emitted from the second end portion 17 by the curved surface 17 a and is internally reflected by the second end portion 17. The amount of light is reduced, light is excessively emitted from the region portion 15a, and the luminance of the region portion 15a is not particularly increased with respect to other portions, and the occurrence of uneven brightness in the light guide 7 is suppressed. Can do.

  Hereinafter, a light guide 7A according to a modification of the light guide 7 will be described (see FIGS. 8 to 12).

  The light guide 7A is formed of a transparent material, and has a light guide portion 20 extending in a direction along the cover 3 and attached portions 21 and 21 protruding from both end portions in the longitudinal direction of the light guide portion 20, respectively. (See FIG. 8).

  The light guide 7 </ b> A is disposed in the lamp chamber 5 by being attached to the mounting member (not shown) in which the mounted portions 21 and 21 are disposed in the lamp chamber 5 or the lamp housing 2 by screwing or the like.

  The light guide 20 is formed in a substantially circular shape in a cross-sectional shape orthogonal to the longitudinal direction (see FIG. 9). The light guide 20 is formed as a reflection surface 22 on the lamp housing 2 side that reflects light internally, and reflection steps 22a, 22a, ... are formed on the reflection surface 22 at regular intervals in the longitudinal direction. (See FIG. 10). The reflection steps 22 a, 22 a,... Have a function of guiding light in the longitudinal direction of the light guide unit 20 by internally reflecting light.

  The portions between the reflection steps 22a, 22a,... Of the reflection surface 22 are formed as control surfaces 22b, 22b,.

  The light guide 20 has a surface on the cover 3 side formed as an emission surface 23 that emits light (see FIGS. 9 and 10). However, also on the exit surface 23, depending on the incident angle of the light with respect to the exit surface 23, the light is internally reflected by the exit surface 23 and guided in the longitudinal direction of the light guide unit 20.

  The control surface 22b of the reflection surface 22 is formed in a non-parallel state with respect to the emission surface 23, and is inclined with respect to the emission surface 23 (see FIG. 10). A dotted line H shown in FIG. 10 is an imaginary line parallel to the emission surface 23.

  The light guide unit 20 is formed with both end surfaces in the longitudinal direction as incident surfaces. A light source is arranged at a position facing each incident surface of the light guide 20.

  As shown in FIG. 8, the light guide unit 20 includes a substantially linear extension part 24, a curved part 25 that is continuous with the extension part 24 and gently curved, and a linear part that is continuous with the curved part 25. The first step forming portion 26 includes a bent portion 27 that is continuous with the first step forming portion 26, and a linear second step forming portion 28 that is continuous with the bent portion 27.

  First light control steps 26a, 26a,... Are formed at the end of the first step forming portion 26 on the bent portion 27 side (see FIGS. 11 and 12). The first light control steps 26a, 26a,... Are formed in the circumferential direction with respect to the reflecting surface 22, for example, at positions separated by 90 ° to 150 °.

  The bent portion 27 is formed in a curved shape bent in a state where the bent portion 27 is bent approximately 90 °. Diffusion steps 27 a, 27 a,... Are continuously formed in the circumferential direction on the outer peripheral surface of the bent portion 27. The diffusion steps 27 a, 27 a,... Are formed in substantially half of the outer peripheral surface of the bent portion 27 on the cover 3 side. The diffusion steps 27a, 27a,... Are formed in a cylindrical step, for example.

  Second light control steps 28a, 28a,... Are formed at the end of the second step forming portion 28 on the bent portion 27 side. The second light control steps 28 a, 28 a,... Are formed in the circumferential direction with respect to the reflecting surface 22, for example, at positions separated by 90 ° to 150 °.

  The first light control steps 26a, 26a,... Of the first step forming unit 26 and the second light control steps 28a, 28a,. It has a function of reflecting the inner surface toward the inner peripheral portion 27b.

  In the vehicle lamp 1 provided with the light guide 7 </ b> A, when light is emitted from each light source, the emitted light is incident from each incident surface of the light guide unit 20.

  The light incident from one incident surface is internally reflected by the reflection steps 22a, 22a,... And guided from the extending portion 24 to the bent portion 27 via the first light control step 26. The light that is incident and guided from one incident surface is emitted from the emission surface 23 of the light guide unit 20 at any time during the light guiding process.

  The light guided to the first light control step 26 and incident on the first light control steps 26a, 26a,... Is internally reflected at the first light control steps 26a, 26a,. It goes to the inner peripheral part 27b of the part 27.

  The light guided from the first light control step 26 toward the bent portion 27 is diffused in the diffusion steps 27 a, 27 a,... And a part thereof is emitted from the emission surface 23 of the bent portion 27.

  Further, the light is guided from the bent portion 27 toward the second light control step 28 and is also emitted from the emission surface 23 of the second light control step 28.

  The light incident from the other incident surface is internally reflected by the reflection steps 22 a, 22 a,... And guided from the second light control step 28 toward the bent portion 27. Light that is incident and guided from the other incident surface is also emitted from the emission surface 23 of the light guide unit 20 as needed during the light guiding process.

  The light incident on the second light control steps 28a, 28a,... Of the second light control step 28 is internally reflected at the second light control steps 28a, 28a,. Head to the inner periphery 27b.

  The light guided from the second light control step 28 toward the bent portion 27 is diffused in the diffusion steps 27a, 27a,... And part of the light is emitted from the exit surface 23 of the bent portion 27.

  Further, the light is guided from the bent portion 27 to the extension portion 24 through the first light control step 26, and is emitted from the first light control step 26 and the emission surface 23 of the extension portion 24.

  In the light guiding process, light is incident on the control surfaces 22b, 22b,. Since the control surfaces 22b, 22b,... Are formed in a non-parallel state with respect to the emission surface 23, the light incident on the control surface 22b from the inside of the vehicle and reflected from the inner surface is controlled by the control surface. Compared to the case where the vehicle is formed in a state parallel to the vehicle 23, the vehicle can be easily directed to the outside of the vehicle. That is, as shown in FIG. 10, when the control surface is formed in a state parallel to the emission surface 23, the light A that is internally reflected is easily directed to the emission surface 23 side, but the control surface 22 b is the same as the emission surface 23. In the case where the light B is formed in a non-parallel state, the reflection angle of the light B reflected from the inner surface is larger than that of the light A, and the light B is likely to go outside the vehicle.

  As described above, in the light guide 7A, the control surface 22b is formed in a non-parallel state with respect to the emission surface 23, so that light can be easily directed to the outside of the vehicle. Therefore, by making the light easy to go to the outside of the vehicle, the viewing angle of the light emitted from the vehicle lamp 1 outside the vehicle is increased, and the safety is improved by improving the visibility with respect to the vehicle lamp 1. be able to.

  On the other hand, a method of replacing a part of the reflection step 22a with an inclined surface that is inclined with respect to the emission surface 23 in order to increase the viewing angle of the light emitted from the vehicular lamp 1 by making the light easy to go to the outside of the vehicle. However, in this case, the area of the portion that reflects light to the inner surface toward the exit surface 23 of the reflection step 22a is reduced, and the amount of light emitted from the exit surface 23 is reduced to reduce the output light rate. This will cause a problem.

  Therefore, as described above, the portion between the reflection steps 22a, 22a,... Is formed as the control surfaces 22b, 22b,. It is possible to improve safety by improving the visibility of the vehicular lamp 1 without coming.

  As described above, in the vehicular lamp 1 provided with the light guide 7A, the light guide 7A has the bent portion 27 in which the emission surface 23 is formed, and the first light control steps 26a, 26a, , And second light control steps 28a, 28a,... Are formed, and a first step forming portion 26 and a second step forming portion 28 that are less bent than the bent portion 27 are provided. At least a part of the light controlled in the first light control steps 26a, 26a,... And the second light control steps 28a, 28a,.

  Therefore, the first light control steps 26a, 26a,... And the second light control step formed in the first step forming part 26 and the second step forming part 28, which are less bent than the bent part 27. Since the light controlled by 28a, 28a,... Is emitted from the exit surface 23 of the bent portion 27, the light emitted from the exit surface 23 of the bent portion 27 is controlled to cause uneven brightness in the light guide 7A. Occurrence can be suppressed.

  In addition, the first step forming part 26, the second step forming part 28, and the bent part 27 are continuously provided in the light traveling direction, and the first light control steps 26a, 26a,. Are guided to the inner peripheral portion 27b of the bent portion 27 by the light control steps 28a, 28a,.

  Accordingly, since the amount of light guided to the inner peripheral portion 27b of the bent portion 27 increases, the light emitted from the outer peripheral side and the inner peripheral side of the bent portion 27 is made uniform, and uneven brightness in the light guide 7A is reduced. Occurrence can be suppressed.

  In the above, an example of the light guide 7 in which both end portions in the longitudinal direction are shielded by the extension 6 is shown. However, for example, in a state where the light guide 7 is not shielded by the extension 6 as in the following light guide 7B. There is also a configuration in which light is emitted from the end 30 in the longitudinal direction (see FIG. 13).

  In such a light guide 7B, when the reflection steps 31a, 31a,... Are formed on the reflection surface 31 so as to be separated from each other in the longitudinal direction, total reflection is performed at the reflection steps 31a, 31a,. .. Easily reach specific portions 32 a, 32 a,... Of the exit surface 32, and light flux density is likely to occur between the portions 32 a, 32 a,.

  Therefore, it is desirable to form diffusion steps 32b, 32b,... On the light exit surface 32 in the light guide 7B (see FIG. 14). As the diffusion steps 32b, 32b,..., For example, a cylindrical step extending in the longitudinal direction of the light guide 7B (see FIG. 15), and a cylindrical step extending in the circumferential direction of the light guide 7B and aligned in the longitudinal direction. (See FIG. 16) It is desirable to form fish-eye steps (see FIG. 17) formed in a matrix.

  The diffusion steps 32b, 32b,... Are formed on the exit surface 32, so that the light totally reflected by the reflection steps 31a, 31a,. The light diffused and emitted from the emission surface 32 is made uniform, and the occurrence of uneven brightness is suppressed.

  The diffusion step (see FIGS. 15 to 17) such as a cylindrical step and a fish-eye step has a configuration in which light control steps 13b, 13b,... Are formed on the outer peripheral surface of the step forming unit 13 (FIG. 3). ), The light control steps 13b, 13b,... May be used as an example. That is, the light control steps 13b, 13b,... May be cylindrical steps, fish-eye steps, or the like shown in FIGS.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 7 ... Light guide, 10 ... Plate-shaped part, 11 ... Reflecting surface, 12 ... Output surface, 13 ... Step formation part, 13a ... Incident surface, 13b ... Light control step, 14 ... Bending part, 17a ... curved surface, 18 ... light source, 7A ... light guide, 22 ... reflecting surface, 23 ... emission surface, 26 ... first step forming part, 26a ... first light control step, 27 ... bending part, 28 ... first Step forming unit 2, 28 a... Second light control step

Claims (5)

A light guide having an incident surface on which light emitted from a light source is incident, a reflecting surface that internally reflects light incident from the incident surface, and an emitting surface that emits light internally reflected by the reflecting surface is provided. A vehicle lamp,
The light guide is provided with a bent portion in which at least a part of the emission surface is formed and bent in a predetermined state, and a step forming portion in which a light control step is formed and the degree of bending is smaller than that of the bent portion. ,
A vehicle lamp in which at least a part of the light controlled in the light control step is emitted from an exit surface of the bent portion. The vehicular lamp according to claim 1, wherein a diffusion step is formed as the light control step. The vehicular lamp according to claim 2, wherein a cylindrical step provided continuously in a circumferential direction of the step forming portion is formed as the diffusion step. The light guide is provided with a plate-like portion that is continuous with the bent portion and into which light transmitted through the bent portion is incident,
4. The vehicular lamp according to claim 1, wherein the plate-like portion has a curved end surface in a traveling direction of light incident from the bent portion. 5. The step forming portion and the bent portion are continuously provided in the traveling direction of light,
The vehicular lamp according to claim 1, 2, 3, or 4, wherein light is guided to an inner peripheral portion of the bent portion by the light control step.

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